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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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Modifying Global PVST+ Parameters

The root bridge sets the values for forward-delay and hello-time, and overwrites the values set on other PVST+ bridges.

  • Forward-delay — the amount of time an interface waits in the Listening state and the Learning state before it transitions to the Forwarding state.
  • Hello-time — the time interval in which the bridge sends bridge protocol data units (BPDUs).
  • Max-age — the length of time the bridge maintains configuration information before it refreshes that information by recomputing the PVST+ topology.

To change PVST+ parameters on the root bridge, use the following commands.

  • Change the forward-delay parameter.
    PROTOCOL PVST mode
    vlan forward-delay
    The range is from 4 to 30.
    The default is 15 seconds.
  • Change the hello-time parameter.
    PROTOCOL PVST mode
    vlan hello-time
    NOTE With large configurations (especially those configurations with more ports), Dell EMC Networking recommends increasing the hello-time.
    The range is from 1 to 10.
    The default is 2 seconds.
  • Change the max-age parameter.
    PROTOCOL PVST mode
    vlan max-age
    The range is from 6 to 40.
    The default is 20 seconds.
The values for global PVST+ parameters are given in the output of the show spanning-tree pvst command.

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